Razor lock



H. L.. BAKER May 3, 1955 RAZOR LOCK Filed Oct. 6, 1954 l MMWTM Y //////////////////,//////////}/4 v :uvam-on Howard L ,.Bakez" ATTORNEYS United States Patent O RAZOR LOCK Howard L. Baker, Stockton, Calif. Application ctober 6, 1i954, Serial No. 460,728

2 Claims. (Cl. Sti-J3) This invention relates to safety razors of that general type which includes separable handle-mounted members between which a blade is removably clamped; removal of the blade being ordinarily performed by the user by proper manipulation of the handle.

The major object of the present invention is to provide a razor of the above general type which is particularly designed for the use or" mental patients and the like who, While able to shave themselves, cannot be trusted with a bare or free blade.

To this end, the improved razor is provided with means to releasably lock the blade in place, but which means requires the use of a tool to manipulate the unlocking means, and which tool is of course of a character which would not be found in a washroom or'the like, and would not in any case be left by an attendant where it could be reached and handled by a patient.

A further object of the invention is to provide a blade locking and unlocking means which can be readily and quickly actuated by use of the proper tool, which of itself is of conventional form.

Still another object of the invention is to provide a razor lock which is designed for ease and economy of manufacture.

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

in the drawings:

Fig. 1 is an enlarged sectional elevation of the improved razor, as ready for use.

Fig. 2 is a longitudinal elevation showing the several parts of the razor in separated but alined relation to each other.

Referring now more particularly to the drawings, and to the characters of reference marked thereon, the razor as a whole is of conventional construction and comprises a rigid rectangular head l having a central threaded stud 2 projecting from its face; the blade-retaining plate and comb 3 having a central opening 4 through which the stud projects. rl`he stud is of a length such that the threaded portion thereof projects clear of the plate 3 when said plate and the head l are disposed in close relation with a blade 5 clamped therebetween in the customary manner.

A tubular handle 6 is tapped, as at 7, at its inner end to screw onto the stud, so that upon rotation of the handle after the inner end thereof is engaged with the under sit-'f the plate 3, the head 1 and said plate may be advanced toward each other to releasably clamp the blade 5 therebetween, as is necessary for shaving purposes.

Thus far, the construction above described is the same as that of a certain conventional safety razor, and the additional features, whereby such a razor is adapted for my specific purpose, are arranged as follows:

Slidable in the handle 6 is a stem 8 whose inner end is tapenpointed, as at 9, while the threaded portion of the stud 2 is provided with a diametral slot 10 open to the inner end of the stud, and whose width is such that the stem point 9, when advancing, will engage intermediate the length of said point with the opposite sidewalls of the slot.

The length of the stem 8 is less than that of the handle so that the stern is normally countersunk an appreciable distance therein, and the bore 11 of the handle along the portion thereof outwardly of the stern is tapped for the reception of a socket-type set screw l2 which, when fully advanced, is also preferably coun'tersunk slightly in the handle, as shown in Fig. 1, so that said screw cannot possibly be gripped about its periphery.

To mount a blade in place between the head 1 and plate 3, it is necessary to first allow the stem 8 to retract by retracting the set screw 12) so that the handle may be screwed onto the stud 2 to draw the head 1 and plate 3 together and tightly clamp the blade 5 therebetween, without the stud being subjected to any expanding or binding action during the blade clamping operation.

When the blade is properly clamped in position, a manual tool (not shown) of a conventional type is engaged with the socket of the set screw 12 to rotate the latter in an advancing direction. Such rotation advances the stem S, causing the taper point 10 to tightly engage the opposed walls of slot 10 in stud 2, and expanding or deforming the latter so that the threads thereof wedgingly engage the threads 7 in the handle.

lt will then be found impossible for the handle to be turned. by the bare hands, to unscrew it from the stem and release the plate 3 from the blade. Such release, and disengagement of the parts to enable the blade to be removed, can only be effected after retracting the set screw by the use of said manual tool. Such retraction of course enables the stem 8 to retract; the squeeze of the inherently resilient opposed parts of the stud 4 against the sloping face of point 9 effecting such retraction.

From the foregoing description it will be readily seen that there has been produced such a device as will substantially fulfill the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations therefrom may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

1. A safety razor comprising a head having a threaded stud projecting inwardly therefrom, a plate slidable on the stud and separable therefrom so that a blade may be removably disposed between the head and plate, a handle removably screwed onto the stud beyond the plate and arranged, upon advance of said handle along the stud by rotation of such handle, to engage the plate and move the same toward the head to clamp the blade between said head and plate, said stud being slotted to its outer end for expansion, a stem slidably mounted within the handle and having a taper point on its inner end to enter the slot and engage the walls thereof, and means within the handle to advance the stem.

2. A razor, as in claim 1, in which said last named means comprises a set screw socketed to receive a turning tool, said screw being threaded into the handle at its outer end and engaging the outer end of the stem.

References Cited in the tile of this patent UNITED STATES PATENTS 1,031,978 Ainslie July 9, 1912 1,467,930 Fretwell Sept. ll, 1923 2,003,872 Thislethwaite June 4, 1935 FORElGN PATENTS 102,534 Sweden Sept. 9, 1941 

